Boiler and metallurgical furnace



Model.) 3 Sheets-Sheet 1. J J. W,. MOGRANAHAN.

BOILER AND METALLURGICAL FURNACE.

No. 532,690. Patented Jan. 15, 1895..

INVENTOI? WITNESSES:

- A TTORNEYS.

m: 'IORRIS PETERS co" Pnumumo" WASHINGTON n. cy

(No Model.) L 3 Sheets-Sheet 2.

' J. W. MGGRANAHAN.

BOILER AND METALLURGICAL FURNACE. No. 532,690.

WITNESSES.

' INVENTOH ATTORNEYS.

3 Sheets-Sheet 3.

Patented Jan. 15,- 1895.

I: llll Ill-ll (No Mbdel.)

J. W. MQGRANA'HAN. BOILER AND METALLURGICAL FURNACE. NO. 532,690.

UHUUBHUDUUUUUUU WITNESSES: INVENTOR A TTORNE Y8.

.VUN'ITED STATES PATENT OFFICE.

JAMES W. MOGRANAHAN, or HARRISON, NEW JERSEY.

Y BOILER AND. METALLURGICAL FUVRNACEV. I

- $PECIFIGATION forming part of Letters Patent No. 532,690, dated January 15, 1895.

- Application filed January 5, 1894. Serial No. 495,838. (No model.)

To 00% whom it may concern.- 4

Be it known that I, JAMES W. MOGRANA- HAN, of Harrison, in the county of Hudson and State of New Jersey, have invented a new and Improved Boiler and Metallurgical Furnace, of which the following is a full, clear, and exact description.

Myinvention relates to furnaces for heating boilers, reverberatory and open hearth furnaces and similar structures. By my invention the fire is burned on a grate situated at some distance from where the heat is to be applied. Such grate may be of the ordinary type of step grate or of the kind used in Sic mens furnaces, the object being to produce a quantity of incompletely burned and therefore combustible gases. The stream of gas produced in the grate is led through flues to the fire box of the boilers, or to the bed of the furnace or other place where the heat is desired to be generated. Thus, beneath the boilers or in the furnace I'maintain a clear gas fire, all ashes and dirt of every description being far removed therefrom. If now, air were supplied directly to the fire chamber from the outside there would be a great waste of heat owing to the inevitable cooling'of the gases from the fire on'their way through the flues to the fire chamber. To avoid such loss of heat I conduct the air required for the combustion of the gases through flues or heaters contiguous to the smoke or gas fiues, the walls,

parts in all the figures.

Figure 1 is a horizontal partly sectional view of my improved furnace. Fig. 2 is a vertical and longitudinal, partly sectional View of the same. Fig. 3 is a vertical cross section showing the arrangement of air and gas fines in what Iterm the reheating portion of my device; and Fig. 4 is a cross section showing the perforated bridge wall. The section of Fig. 1 follows the dotted lines1-1 of Fig. 2. The

section of Fig. 2 follows the dotted line 2-2 of Fig. 1. The section of Fig. 3 follows the dotted line 3 3 of Fig. 2. The section of Fig. 4 followsthe dotted line 4-4: of Fig. 2.

A, is the grate or fire place fed with coal through the fire doors by regular process. From the grate the combustible gases go through the flues B, B, following the course of the arrows and reaching the furnace by the centrally disposed flue C in which the several gas flues unite. The air enters by flue openings D, D, and in the reheaters E, E, follows as forced to by the diaphragms and walls, asinuous course up and down through the heaters and finally by the flues F, F, reaches the perforated bridge wall G, where it is admitted to the fire chamber.

The gases to be delivered to the fire chamber enter it by a flue or upcast H, reaching up throughits floor. The air for the combustion of the gases reaches the fire chamber through a similar flue perforated to permit the outflow of the air, and so arranged as to constitute a bridge wall. The openings in the bridge wall are adapted to discharge the void of all ashes and solid matter.

The draft of 'air may be accelerated ifdesired, by the use of a blower, or a chimney of the ordinary/ construction may be used to maintain the necessary current through the heater and connecting flues.

The ordinary devices may be used to admit of extra or cold air to the fire chamber of the boiler by adjustable ports or dampers on its front or sides, the use of such, however, forming no part of this invention.

I do not confine myself to the exact construction shown in the drawings, but it will be obvious that additions and minor changes may be made, or equivalents substituted for some of the parts, without departing from the nature of the invention as defined in the appended claims.

Having thus described my invention, 1 a pluralityof gas fiues arranged in the rear claim as new and desire to secure by Letters of the fire-place, air chambers extending lon- Patentgitndinally between the said gas fines and 1. The combination with the fire-place, of provided with diaphragrns to produce sinuous 5 a plurality of parallel gas fines arranged in channels for the air, a gas line into which dis- 20 the rear of the fire-place, and separate air charge the aforesaid gas flues, a combustion chambers extending longitudinally of the gas chamber into which discharges the said gas fines and arranged between each two gas fines, flue, a perforated bridge wall located in the said chambers being provided with vertical said combustionchamber, and air flues con- 1o alternately overlapping diaphragiiis to pronecting the air chambers with the said bridge 25 duce sinuous channels for the air to compel wall, substantially as described.

it to travel alternately up and down while it JAMES W. MCGRANAHAN. proceeds from one end of each chamber to the Witnesses: other end thereof, substantially as described. O. SEDGW'IOK;

r 5 2. The combination, with the fire-p1ace,of F. W. I'IANAFORD. 

